Purebloggers

Got a little email today inviting me to Purebloggers.com or some such other. They said someone "liked" my blog and therefore, I got invited (yeah, and I have a swimming pool in Arizona I'd like to sell to you). I'm pretty sure they invite everyone, but per chance if you happen to know more about Purebloggers, you could explain a bit more because at the moment, "I'm not interested." Never heard of 'em.